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  <div class="section" id="seutils-module">
<h1>SEutils Module<a class="headerlink" href="#seutils-module" title="Permalink to this headline">¶</a></h1>
<p class="graphviz">
<img src="../../_images/inheritance-9f3c7bc88811fee87e07a30133f7586cb9c7a2ee.png" alt="Inheritance diagram of virtualsmartcard.SEutils" usemap="#inheritance7064aeb8f6" class="inheritance"/>
<map id="inheritance7064aeb8f6" name="inheritance7064aeb8f6">
<area shape="rect" id="node1" href="#virtualsmartcard.SEutils.ControlReferenceTemplate" title="Control Reference Templates are used to configure the Security" alt="" coords="5,55,353,80"/>
<area shape="rect" id="node2" href="#virtualsmartcard.SEutils.Security_Environment" title="virtualsmartcard.SEutils.Security_Environment" alt="" coords="20,5,339,31"/>
</map>
</p>
<span class="target" id="module-virtualsmartcard.SEutils"></span><dl class="class">
<dt id="virtualsmartcard.SEutils.ControlReferenceTemplate">
<em class="property">class </em><tt class="descclassname">virtualsmartcard.SEutils.</tt><tt class="descname">ControlReferenceTemplate</tt><big>(</big><em>tag</em>, <em>config=''</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.ControlReferenceTemplate" title="Permalink to this definition">¶</a></dt>
<dd><p>Control Reference Templates are used to configure the Security
Environments. They specify which algorithms to use in which mode of
operation and with which keys. There are six different types of Control
Reference Template:
HT, AT, KT, CCT, DST, CT-sym, CT-asym.</p>
<dl class="method">
<dt id="virtualsmartcard.SEutils.ControlReferenceTemplate._ControlReferenceTemplate__replace_tag">
<tt class="descname">_ControlReferenceTemplate__replace_tag</tt><big>(</big><em>tag</em>, <em>data</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.ControlReferenceTemplate._ControlReferenceTemplate__replace_tag" title="Permalink to this definition">¶</a></dt>
<dd><p>Adjust the config string using a given tag, value combination. If the
config string already contains a tag, value pair for the given tag,
replace it. Otherwise append tag, length and value to the config
string.</p>
</dd></dl>

<dl class="method">
<dt id="virtualsmartcard.SEutils.ControlReferenceTemplate._ControlReferenceTemplate__set_algo">
<tt class="descname">_ControlReferenceTemplate__set_algo</tt><big>(</big><em>data</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.ControlReferenceTemplate._ControlReferenceTemplate__set_algo" title="Permalink to this definition">¶</a></dt>
<dd><p>Set the algorithm to be used by this CRT. The algorithms are specified
in a global dictionary. New cards may add or modify this table in order
to support new or different algorithms.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>data</strong> &#8211; reference to an algorithm</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="virtualsmartcard.SEutils.ControlReferenceTemplate._ControlReferenceTemplate__set_iv">
<tt class="descname">_ControlReferenceTemplate__set_iv</tt><big>(</big><em>tag</em>, <em>length</em>, <em>value</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.ControlReferenceTemplate._ControlReferenceTemplate__set_iv" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>

<dl class="method">
<dt id="virtualsmartcard.SEutils.ControlReferenceTemplate._ControlReferenceTemplate__set_key">
<tt class="descname">_ControlReferenceTemplate__set_key</tt><big>(</big><em>tag</em>, <em>value</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.ControlReferenceTemplate._ControlReferenceTemplate__set_key" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>

<dl class="method">
<dt id="virtualsmartcard.SEutils.ControlReferenceTemplate.parse_SE_config">
<tt class="descname">parse_SE_config</tt><big>(</big><em>config</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.ControlReferenceTemplate.parse_SE_config" title="Permalink to this definition">¶</a></dt>
<dd><p>Parse a control reference template as given e.g. in an MSE APDU.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>config</strong> &#8211; a TLV string containing the configuration for the CRT.</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="virtualsmartcard.SEutils.ControlReferenceTemplate.to_string">
<tt class="descname">to_string</tt><big>(</big><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.ControlReferenceTemplate.to_string" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the content of the CRT, encoded as TLV data in a string</p>
</dd></dl>

</dd></dl>

<dl class="class">
<dt id="virtualsmartcard.SEutils.Security_Environment">
<em class="property">class </em><tt class="descclassname">virtualsmartcard.SEutils.</tt><tt class="descname">Security_Environment</tt><big>(</big><em>MF</em>, <em>SAM</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.Security_Environment" title="Permalink to this definition">¶</a></dt>
<dd><p>Bases: <tt class="xref py py-class docutils literal"><span class="pre">object</span></tt></p>
<dl class="method">
<dt id="virtualsmartcard.SEutils.Security_Environment._set_SE">
<tt class="descname">_set_SE</tt><big>(</big><em>p2</em>, <em>data</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.Security_Environment._set_SE" title="Permalink to this definition">¶</a></dt>
<dd><p>Manipulate the current Security Environment. P2 is the tag of a
control reference template, data contains control reference objects</p>
</dd></dl>

<dl class="method">
<dt id="virtualsmartcard.SEutils.Security_Environment.compute_cryptographic_checksum">
<tt class="descname">compute_cryptographic_checksum</tt><big>(</big><em>p1</em>, <em>p2</em>, <em>data</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.Security_Environment.compute_cryptographic_checksum" title="Permalink to this definition">¶</a></dt>
<dd><p>Compute a cryptographic checksum (e.g. MAC) for the given data.
Algorithm and key are specified in the current SE</p>
</dd></dl>

<dl class="method">
<dt id="virtualsmartcard.SEutils.Security_Environment.compute_digital_signature">
<tt class="descname">compute_digital_signature</tt><big>(</big><em>p1</em>, <em>p2</em>, <em>data</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.Security_Environment.compute_digital_signature" title="Permalink to this definition">¶</a></dt>
<dd><p>Compute a digital signature for the given data.
Algorithm and key are specified in the current SE</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>p1</strong> &#8211; Must be 0x9E = Secure Messaging class for digital signatures</li>
<li><strong>p2</strong> &#8211; Must be one of 0x9A, 0xAC, 0xBC. Indicates what kind of data
is included in the data field.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="virtualsmartcard.SEutils.Security_Environment.decipher">
<tt class="descname">decipher</tt><big>(</big><em>p1</em>, <em>p2</em>, <em>data</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.Security_Environment.decipher" title="Permalink to this definition">¶</a></dt>
<dd><p>Decipher data using key, algorithm, IV and Padding specified
by the current Security environment.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">raw data (no TLV coding). Padding is not removed!!!</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="virtualsmartcard.SEutils.Security_Environment.encipher">
<tt class="descname">encipher</tt><big>(</big><em>p1</em>, <em>p2</em>, <em>data</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.Security_Environment.encipher" title="Permalink to this definition">¶</a></dt>
<dd><p>Encipher data using key, algorithm, IV and Padding specified
by the current Security environment.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">raw data (no TLV coding).</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="virtualsmartcard.SEutils.Security_Environment.generate_public_key_pair">
<tt class="descname">generate_public_key_pair</tt><big>(</big><em>p1</em>, <em>p2</em>, <em>data</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.Security_Environment.generate_public_key_pair" title="Permalink to this definition">¶</a></dt>
<dd><p>The GENERATE PUBLIC-KEY PAIR command either initiates the generation
and storing of a key pair, i.e., a public key and a private key, in the
card, or accesses a key pair previously generated in the card.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><strong>p1</strong> &#8211; should be 0x00 (generate new key)</li>
<li><strong>p2</strong> &#8211; &#8216;00&#8217; (no information provided) or reference of the key to
be generated</li>
<li><strong>data</strong> &#8211; One or more CRTs associated to the key generation if
P1-P2 different from &#8216;0000&#8217;</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="virtualsmartcard.SEutils.Security_Environment.hash">
<tt class="descname">hash</tt><big>(</big><em>p1</em>, <em>p2</em>, <em>data</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.Security_Environment.hash" title="Permalink to this definition">¶</a></dt>
<dd><p>Hash the given data using the algorithm specified by the current
Security environment.</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">raw data (no TLV coding).</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="virtualsmartcard.SEutils.Security_Environment.manage_security_environment">
<tt class="descname">manage_security_environment</tt><big>(</big><em>p1</em>, <em>p2</em>, <em>data</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.Security_Environment.manage_security_environment" title="Permalink to this definition">¶</a></dt>
<dd><p>This method is used to store, restore or erase Security Environments
or to manipulate the various parameters of the current SE.
P1 specifies the operation to perform, p2 is either the SEID for the
referred SE or the tag of a control reference template</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><strong>p1</strong> &#8211; <p>Bitmask according to this table</p>
<table border="1" class="docutils">
<colgroup>
<col width="4%" />
<col width="4%" />
<col width="4%" />
<col width="4%" />
<col width="4%" />
<col width="4%" />
<col width="4%" />
<col width="4%" />
<col width="71%" />
</colgroup>
<thead valign="bottom">
<tr class="row-odd"><th class="head">b8</th>
<th class="head">b7</th>
<th class="head">b6</th>
<th class="head">b5</th>
<th class="head">b4</th>
<th class="head">b3</th>
<th class="head">b2</th>
<th class="head">b1</th>
<th class="head">Meaning</th>
</tr>
</thead>
<tbody valign="top">
<tr class="row-even"><td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td>1</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td>Secure messaging in command data field</td>
</tr>
<tr class="row-odd"><td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td>1</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td>Secure messaging in response data field</td>
</tr>
<tr class="row-even"><td><ul class="first last simple">
<li></li>
</ul>
</td>
<td>1</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td>Computation, decipherment, internal
authentication and key agreement</td>
</tr>
<tr class="row-odd"><td>1</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td>Verification, encipherment, external
authentication and key agreement</td>
</tr>
<tr class="row-even"><td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td><ul class="first last simple">
<li></li>
</ul>
</td>
<td>0</td>
<td>0</td>
<td>0</td>
<td>1</td>
<td>SET</td>
</tr>
<tr class="row-odd"><td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>0</td>
<td>0</td>
<td>1</td>
<td>0</td>
<td>STORE</td>
</tr>
<tr class="row-even"><td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>0</td>
<td>0</td>
<td>1</td>
<td>1</td>
<td>RESTORE</td>
</tr>
<tr class="row-odd"><td>1</td>
<td>1</td>
<td>1</td>
<td>1</td>
<td>0</td>
<td>1</td>
<td>0</td>
<td>0</td>
<td>ERASE</td>
</tr>
</tbody>
</table>
</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="virtualsmartcard.SEutils.Security_Environment.parse_SM_CAPDU">
<tt class="descname">parse_SM_CAPDU</tt><big>(</big><em>CAPDU</em>, <em>authenticate_header</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.Security_Environment.parse_SM_CAPDU" title="Permalink to this definition">¶</a></dt>
<dd><p>This methods parses a data field including Secure Messaging objects.
SM_header indicates whether or not the header of the message shall be
authenticated. It returns an unprotected command APDU</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>CAPDU</strong> &#8211; The protected CAPDU to be parsed</li>
<li><strong>authenticate_header</strong> &#8211; Whether or not the header should be
included in authentication mechanisms</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">Unprotected command APDU</p>
</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="virtualsmartcard.SEutils.Security_Environment.perform_security_operation">
<tt class="descname">perform_security_operation</tt><big>(</big><em>p1</em>, <em>p2</em>, <em>data</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.Security_Environment.perform_security_operation" title="Permalink to this definition">¶</a></dt>
<dd><p>In the end this command is nothing but a big switch for all the other
commands in ISO 7816-8. It will invoke the appropriate command and
return its result</p>
</dd></dl>

<dl class="method">
<dt id="virtualsmartcard.SEutils.Security_Environment.protect_response">
<tt class="descname">protect_response</tt><big>(</big><em>sw</em>, <em>result</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.Security_Environment.protect_response" title="Permalink to this definition">¶</a></dt>
<dd><p>This method protects a response APDU using secure messaging mechanisms</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">the protected data and the SW bytes</td>
</tr>
</tbody>
</table>
</dd></dl>

<dl class="method">
<dt id="virtualsmartcard.SEutils.Security_Environment.verify_certificate">
<tt class="descname">verify_certificate</tt><big>(</big><em>p1</em>, <em>p2</em>, <em>data</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.Security_Environment.verify_certificate" title="Permalink to this definition">¶</a></dt>
<dd><p>Verify a certificate send by the terminal using the internal trust
anchors.
This method is currently not implemented.</p>
</dd></dl>

<dl class="method">
<dt id="virtualsmartcard.SEutils.Security_Environment.verify_cryptographic_checksum">
<tt class="descname">verify_cryptographic_checksum</tt><big>(</big><em>p1</em>, <em>p2</em>, <em>data</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.Security_Environment.verify_cryptographic_checksum" title="Permalink to this definition">¶</a></dt>
<dd><p>Verify the cryptographic checksum contained in the data field.
Data field must contain a cryptographic checksum (tag 0x8E) and a plain
value (tag 0x80)</p>
</dd></dl>

<dl class="method">
<dt id="virtualsmartcard.SEutils.Security_Environment.verify_digital_signature">
<tt class="descname">verify_digital_signature</tt><big>(</big><em>p1</em>, <em>p2</em>, <em>data</em><big>)</big><a class="headerlink" href="#virtualsmartcard.SEutils.Security_Environment.verify_digital_signature" title="Permalink to this definition">¶</a></dt>
<dd><p>Verify the digital signature contained in the data field. Data must
contain a data to sign (tag 0x9A, 0xAC or 0xBC) and a digital signature
(0x9E)</p>
</dd></dl>

</dd></dl>

</div>


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